<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>将找到的值乘以 2</title>
</head>
<body>
  <script>
    function fn(nums, original) {
      for (let i = 0; i < nums.length; i++) {
        if (nums[i] === original) {
          original = original * 2
          return fn(nums, original)
        }
      }
      return original
    }
    console.log(fn([5, 3, 6, 1, 12], 3))
  </script>
</body>
</html>